Brake



Oct. 30, 1,934. A Y DODGE 1,978,698

BRAKE Filed March 14. 1929 INVENTOR I BIADIELY Donar-Ll ATTORNEY Patented Oct. 30, 1934 IBRAKE Miei/Y. south nena, ma., mignon to' Duke Company, South Bend, Ind., a

corporation of Illinois Applicaties March 14, 1929, serial No. 346,823 l 'l claims. (cl. iss-7s) This invention relates to brakes, and is illustrated as embodied in an internal expanding brake for an automobile. An object of the invention isftoprovide a. smoothly-acting brake which will in large measure adjust itself auto-` maticallyto compensate'for variations in the coeilicient of friction-of the brake lining, trac-Ky tion of wheels, 'or the like.`

In one desirable arrangement this is accomplished by causing one or more of the shoes to anchor againsta, spring, so that aan-increase in the coeiiicient of friction, whichfo'rdinarily tends to make the brake grab, vcause vthe spring to compress andthe shoe to draw away from the brake-applying means, thus at least' partially compensating for the greater self-energization of the brake.` 'I'he brake anchor, in its arrangement to include the spring, also einbodies substantial novcltyin its construction.

The above and otherobjects and features of the invention, including various novel and desirable structural details, will beapparent from the following description of the illustrativeembodiment shown in the accompanying drawing, in which: l

Figure 1 is a vertical section through the brake, just inside the head ofthe brake drum, and showing the brake shoes in side elevation;

Figure 2 is a section showingthe yielding anchorage, on the line 2--2 of Figure 1;l and Figure 3 is a section on the line`3-3 of Figure 1, showinghow the shoe is guided in its engagement with the spring. i.

In the arrangement shown, the brake includes a rotatable drum 10, at theopen side of which is a suitable support such as a backing plate 12. 'I'he illustrated brake lincludes a primary shoe v14 connected, by a floating pivot 16 to an an- Vcharred secondary shoe 18, together with an auxiliary shoe 20 pivoted on a ilxed anchor 22 carried by the backing plate. The brake is applied by means such as a cam 24 acting against the resistance of return springs 26 and 28. As best appears in Figui-e2I shoe 20 has parallel spaced webs, extended at the bottom of the shoe as arms straddling the end of shoe 18 and pivoted on the anchor 22.

Shoe 18 preferably anchors against a coil compression spring 30, forming part of a novel anchor which includes `a bushing 32 having in its side a socket receiving the spring 30, and

y secured to the backing plate by means such as vlar embodiment, or otherwise than Shoe 18 has welded to its end a thrust plate 38 seated against the spring 30.

While one illustrative embodiment has been described in detail, it is not my intention to limitv the scope of the invention to that particuby the terms of] the appended claims. Y Iclaim:

1. A brake comprising, a friction member, and

a-pivotally mounted cushion anchor therefor.

2. A brake comprising, a backing plate having a plvoted anchor thereon, a friction member, anda spring interposed between one end of the friction memberV and the anchor.

, 3. A brake comprising a friction member having a spring seat, a pivoted anchor having a spring seat', and a compression spring confined therebetween.

4. A brake, anchor having a socket on one'side and a guide beyond the socket, a spring seated in the socket, and a shoe engaged by the guide4 and seated against the spring.

5.1 A brake anchor having a socket and a shoe guide beyond the socket.V

'6. A'brake comprising a friction element, an anchor for the friction element, a member pivoted on the anchor .having a socket, and a, spring seat on' the socket engaging the friction element.

7. A brake comprising a friction element, an anchor for the friction element including a memberjpivoted on the anchor having guides for the reception of the friction element, and a compression member interposed between the friction element and the pivotal member.

ADIELY. DODGE. 

